-- 6 6 --
cdte1de1
Conversion to DC machine
Follow the instructions below:
1. Disconnect connector AP04:X4. (Control signals to/from AP07.)
2. Disconnect connector XS22 from XP22. (42V AC supply to AP07.)
3. Disconnect connector XS21 from XP21. (Supply to fans EV02 and EV03.)
4. DTE 255: Disconnect wire 010 and 011 from the copper rails.
DTE 200: Disconnect connectors XC and XB (wire 010 and 011) from AP09.
5. Remove the shunt cable (2) and the workpiece cable (5) from their connections to the
rails. Connect the two cables to each other and to wire 011.
Note: mark up the cables and the rails before you start disconnecting.
6. Remove the other two cables and connect them to each other. (Cable 4 from L02 and
cable 3).
Remove varistor R10, which is connected between the connections for cable 3 and 5. It is
not used now but must be reconnected when the machine is used as a normal AC/DC
machine.
If you want to measure the arc voltage signal from AP01 (UNORM), connect wires 010
and 011 to cables 3 and 5.
7. It is now possible to remove the whole AC unit of the machine, but it is not neccesarry
for this test.
Note: take care when removing the unit, there is a sharp screw end at the bottom of the
unit.
8. Make a soft start and check the DC functions, see page 58 -- 59.
9. When reconnecting the AC unit, make sure that the copper bars are parallel and properly
tightened to the IGBTs.
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